Honda-SOHC

Refurbing my exhaust system and need to purchase new exhaust gaskets.
I can obtain both copper, or aluminium/fibre items at the same price.
Which is considered to be the best?
TIA!

Quote from: AndyH on December 10, 2019, 09:36:11 AM

Hi folks,
After threatening to sell my 500K1, I've had a change of heart!  It's still with me, I just love to ride the thing, it's so easy to toss around on our twisty hills rides!
OK, so I currently have a 4 into 1 which works quite well (I don't know the maker  ) , but it's starting to rust out and I was and am always a fan of symmetry!  4 into 4s are basically impossible to obtain at a sensible price, particularly here in the Antipodes  so I'm considering a set of Marving 4 into 2s.  The symmetry!
Anyone here used this system, and if so, your thoughts?  Worthwhile as an alternative or not?
TIA

 
Rust in australia 

You better believe it Paul!  I live only 2kms from the Indian Ocean and the prevailing winds carry a fair amount of salty moisture.  We also get quite high humidity at certain times of the year.  The bikes are under cover, but still suffer over time.

Brilliant.

Hopefully the UK will have some warm weather so we can get out.

Great turnout

Sent from my SM-A750FN using Tapatalk

Thanks John!  The last pic of the green K1 is the bike I rode...but it's not mine!
The owner is too short to hold it up when at traffic lights/stop signs etc. so he offered it to me for the ride.
Instead, he rode my 500K1 for the whole trip, although it played up later on due to a suspect bullet connection on the black/white wire to the 1-4 coil.  Solved oncee we arrived home. 

Check the sensors are tightly secured to the backplate.   If the sensor is loose it will overheat.  I'd use threadlock.

Another good point Mike!  I'll make sure both sensors are tight tomorrow.

We checked out the wiring today and found that the black/white connection in the double-female connector to the 1-4 coil appeared somewhat loose.  We fired up the bike on the test fuel tank and I felt that the connector was getting a little warm!
Out with the emery to polish up both male bullets, and a pair of long-nose pliers to squeeze up the female side.  Connected everything up again, and no noticeable warmth from the connector.
Rode home with all 4 pots firing as per normal.
Some longer rides are planned (weather permitting) to see if the issue returns, but I'm confident that we've identified the problem.
 

Have just completed a fabulous 850km (530 mile) return trip from Perth to the SW of Western Australia to celebrate 50 years of the CB750.  My mate was riding my 500 (I was riding his 750K1) and it had no trouble keeping pace with the 22 750s....until late yesterday.


Roland (my mate) reported that it had instantaneously dropped to 2 cylinders for about 3 or 4 km and then straight back to 4.

When we arrived at our stay for the night we did some initial troubleshooting.  We were able to determine that cyl 1 and 4 went missing.
After removing the tank, we checked the connections to the coil in question but nothing was found.


Anyway, on the way home today it intermittently dropped 1 and 4 again and progressively got worse.  Roland managed to limp it home on variously 2 and 4 cyls.  No fluttering/fluffing, just straight to 2, then straight back to 4.

Tomorrow we plan to do more thorough troubleshooting to hopefully identify the problem.  The initial plan is to double check ALL connections and possible intermittent wire-shorts from the Dyna-S to the coils.  If that doesn't reveal anything, then we'll swap the coils over and see what that reveals.  If nothing again, then we may have to suspect the Dyna-S, which BTW has been running without issue since I 1st bought the bike, until this w/end.


For those with experience, does this sound like a good approach?  Are there any other things that we may need to look at?


Fuel issues have been ruled out.  (Someone recently remarked that 99% of fuel problems are electrical!  )


Cheers
Andy

Not sure about your description, do you mean that both advance marks on the advancer were to the left of the static mark(extra advance) or to the right of the static mark(insufficient advance).

Both marks were to the left of the static marker.

Prior to going on a nice ride last weekend, I decided to check the timing using a strobe light.
My ignition system is Dyna S.
Once the bike was warmed up, I checked the idle (~1000rpm) timing and it was at the 1.4 F /2.3 F marks.
However at 2500rpm and above the | | timing marks were not lining up with the outside mark, instead about 5mm (3/16") to the left of the outside mark.
I think I'm missing something fundamental here.....
Can those far more experienced than me please help!

Is pushrod in one piece?

It's in one piece Bryan.